<template>
  <div class="todo-footer" v-show="total">
    <label>
      <!-- <input type="checkbox" :checked="allCheck" @change="checkAll"  /> -->
      <input type="checkbox" v-model="isAll" />
    </label>
    <span> <span>已完成{{ doenTotal }}</span> / {{total}} </span>
    <button class="btn btn-danger" @click="dropobj">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "MyFoot",
  props:["todoList"], //,"dropDone"
  data() {
    return { allCheck: false};
  },
  computed:{
    total(){ return this.todoList.length },
    isAll:{
      get(){
        return this.doenTotal === this.total && this.total > 0;
      },
      set(val){
        this.todoList.forEach(todo => todo.done=val)
      }
    },
    doenTotal(){
      return this.todoList.reduce((pre,todo)=> pre + (todo.done ? 1 : 0) ,0)
    }
  },
  methods: {
    dropobj(){
      this.$emit('dropDone')
    }
  },
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
